Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

How do I re-initialize a class during runtime?

( #57484=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Feb 10, 2001 at 01:30 UTC
Q&A  > object-oriented programming


Description:

Let's say I've loaded a class during compile/run time, and sometime during my program, I want to re-load that class because its source has changed, and use it some more. I doubt it would work, but I tried to put a

 use PeopleClass;

in the middle of my program. Needless to say, I think it pulled the older "PeopleClass" from memory and used it. Any comments, answers?

Answer: How do I re-initialize a class during runtime?
contributed by tadman

You might just want to save the state of your program to a file and re-spawn a new copy of self with this new data. Consider:

if (ClassFileChanged()) { my ($state_file) = SaveToStateFile(); if (!RespawnFromStateFile($state_file)) # I.E. 0 == no +error { exit(0); } else { warn "Could not reload $0 properly.\n"; } }
This will prevent you from crashing your program if you break your class file (i.e. typo, compile error, etc.) and it will give you a chance to fix it properly.

Of course, if you're inside of mod_perl, calling exit(0) will be futile, since mod_perl doesn't care about that sort of stuff and will just call the same program again for the next request.
Answer: How do I re-initialize a class during runtime?
contributed by Trinary

This was answered by myself and a bunch of other folks earlier today. =)

Trinary

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (18)
    As of 2015-07-07 14:48 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (90 votes), past polls